Initial commit:
  - basic file tree
  - apps structure
  - added projects recensions: blender, carmetal, celestia, dr-geo,
    geogebra, gimp, kalgebra, kalzium, kanagram, kgeography, klavaro,
    kmplot, ktechlab, kturtle, librecad, libreoffice, marble-globe,
    netbeans, openteacher, stellarium, step, wxmaxima
  - basic todo list (README.md)
  - basic design